Thanks for the reply Daphne. However, I'm afraid I've deleted my Dropbox account - as well as finding it user unfriendly, I had the dreaded 'black screen' on my laptop y'day morning, and the only new thing I'd installed over the past few weeks was Dropbox - which kept asking to "take control" of my laptop - needless to say I declined, but it seems to have done so anyway, and shut the laptop down in a way which meant I couldn't get it restarted, whether it was carrying a virus/trojan/whatever I don't know - tho I do have antivirus & anti-malware installed. Apple support were excellent in getting me back on track & agreed it was a good idea to get rid. I've discovered google have a facility, whether by app or gmail I can't recall, which is much easier to use, & no security issues with them as far as I'm concerned as long as location's disabled, so will stick with that. Thanks for trying to help anyway - and fwiw I agree with your suggestion of using different browser, as Chrome can be problematic on some sites.
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